南京某工程地下室柱网及顶板结构布置方案研究

安全、适用、经济是设计的原则,其中经济性已经越来越受到建设者和设计者的重视。文章以南京河西某项目的地下室柱网及顶板结构布置方案分析比较过程为例,展示了方案优选的过程及重要性。     

板柱—抗震墙办公楼结构设计

通过工程实例总结了设计板柱—抗震墙结构时应注意的计算方法的选用,等代框架梁宽度计算,平面结构布置等问题,着重阐述了选用等代框架法中梁宽的取值、板厚的取值,以期指导实践。     

GBF高强薄壁管无梁楼盖施工技术探讨

针对高强薄壁管混凝土振捣不密实、GBF管上浮及位移、易损坏的质量通病,阐述了GBF管现浇混凝土空心楼盖施工工艺和施工要点,并提出了施工控制措施,从而有利于该技术的推广应用。     

现浇混凝土空心无梁楼盖技术的设计与应用

对现浇混凝土空心无梁楼盖体系的设计原理怍了探讨，介绍了现浇混凝土空心无梁楼盖体系的构造措施，并对现浇混凝土空心无梁楼盖的适用性和优点怍了阐述。     

宁波市鄞州金贸中心结构设计

从建筑整体分析计算等方面,介绍了宁波鄞州金贸中心大楼的结构设计。针对结构的平面不规则,介绍了在概念设计阶段对平面结构布置的处理。对不同的桩基础方案进行了对比,给出了合理的基础设计方案。针对该建筑地下室无梁楼盖不规则,且存在开洞的问题,对该部分进行了有限元分析,对高应力区域进行了加强。该建筑转换梁采用格构式钢骨混凝土结构,对该大梁进行了内力计算与分析,阐述了其设计要点及应该注意的问题。     

P水电站一管三机机组功率波动的分析与消除

针对P电站一管三机水电机组功率波动现象,发现水力不稳定是引起机组功率波动的主要原因,建立了一管三机引水系统的数值计算模型,计算结果表明球形分岔处的不稳定漩涡是导致水轮机蜗壳压力大幅波动的原因。在实际工程中加装导流板后,机组功率平稳,球形分岔处的漩涡消失,解决了水力不稳定的问题。     

Energy losses at pipe trifurcations

In the case of pipe trifurcation, previous observations report negative energy losses in the centre branch. This causes an anomaly, because there should not be any negative energy loss due to conservation of energy principle. Earlier investigators have suggested that this may be due to the non-inclusion of kinetic energy coefficient (α) in the computations of energy losses without any experimental evidence. In the present work, through experimentally determined velocity profiles, energy loss coefficients have been evaluated. It has been found that with the inclusion of α in the computations of energy loss, there is no negative energy loss in the centre branch.     

水电站无梁钢岔管CAD系统的研究与开发

提出了水电站无梁钢岔管CAD系统的设计思想和总体结构.对岔管体形设计、有限元网格剖分、各段管节展开等模块进行了系统地分析.并在Visual C++.NET 2002环境下,开发出了基于ObjectARX for Auto-CAD 2004的水电站无梁钢岔管CAD应用软件,实现了与有限元分析软件的自动接口.     

三分梁式岔管体形设计与有限元计算

结合埃塞俄比亚GIBEⅢ水电站三分梁式岔管的实际情况,运用锥锥相贯原理及平面几何关系推导出了三分岔管两腰梁和两U梁共点的条件和计算公式,并编写了相应的计算程序,在此基础上对三分岔管体形进行了设计;然后采用ANSYS软件中的APDL参数化设计语言对三分梁式岔管进行了有限元计算,通过以岔管管壁厚度和U梁厚度、内伸宽度为参数对岔管进行多方案比较,最终提出了合理的设计方案.     

Simulation of dynamic crack curving and branching under biaxial loading by a time domain boundary integral equation method

Bifurcation and trifurcation of a fast running crack under various biaxial loading conditions is investigated numerically. The solution procedure for the 2D model in the framework of linear elastodynamics employs a time-domain boundary element method and allows for arbitrary curvilinear crack propagation. Branching events are controlled by the criterion of a critical mode I stress intensity factor while the propagation direction and growth rate of each branch are determined from the criterion of maximum circumferential stress. Numerical results are compared with experimental findings and are discussed with respect to macroscopic and microscopic aspects of dynamic fracture.